CPS hole in a fiesta block to trigger the efi and wasted spark. If you use an escort block you'llneed to drill a very precise hole or get a trigger setup from the likes of Jano at oddkiddcreations.

Edit: Actually, forget that it's irrelevant as you're using mfi... read the post the wrong way round and thought u were putting erst engine in a frst. Yeah it's just the inlet you need worry about.